Oven



Patented June 19, 1928.

v UNITED STATES PATENT OFFICE.

CLARENCE A. HERBST, OF CHICAGO, ILLINOIS, ASSIGNOR TO ECONCMY FUSE AND MANUFACTURING YORK.

COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION. OF NEW oven. v

Application filed June 4,

The present invention relates to ovens.

More particularly the present invention relates to ovens suitable for the heat treatment of articles in an inert atmosphere or in an atmosphere composed of an inert gas mixed with a regulatable amount of active gas or air.

An object of the present invention is to provide an oven suitable for commercial operation which has the advantage that the products of combustion used for heating said oven are also utilized in providing the inert atmosphere referred to.

A further object is to provide an oven in which the products of combustion are recirculated through the oven to provide an inert atmosphere.

Further objects will appear as the description proceeds.

Referring to the drawings.

Figure 1 is a vertical sectional view illustrating more or less diagrammatically one embodiment of the present invention; and

Figure 2 is a View in side elevation of the structure illustrated in Figure 1.

Figure 3 is a view in side elevation of the radiators within the structure taken at right I angles to Fig. 1.

The oven chosen for illustration is indicated by the numeral 1. Said oven includes the closed chamber 2 for receiving the articles to be treated, a false bottom 3 being provided within said chamber 2. The nu meral 4 indicates a heating chamber, separated from the chamber 2 by the wall 5. Within the chamber 4 are burners 6-6, which may be gas burners. Communicating with the heating chamber 4 are the radia tors 77 which communicate with the headers 88, which radiators 7. and headers 8-8 are disposed within the chamber 2. Ducts 9-9 provide communication from the headers 88 to the air pumps 10, the discharge sides of which communicate with the bottom of the chamber 2 below the false bottom 3. Said ducts 99 may be provided with the dampers 9 -9 providing communication with the atmosphere. At the upper portion of the chamber 1 is the stack 11, which may be provided with the by-pass 12 for the purpose of regulating the draft through said stack 11. It will be under stood, of course, that should the draft 1927. Serial No. 196,625.

through stack 11 be sutficient to draw the gases through the ducts 99, no air pumps 10-10 will be required. Should the draft be too'great, said draft can be reduced by opening the by-pass 12. In order to carry out the recirculation within the oven, the joints should be air-tight. One of the ducts 9 is preferably provided with the recorder 13 for recording the CO content of the products of combustion passing from the chamber at through the ducts9.

In operation, articles to be heat treated, such as molded insulation, varnishedarticles, or other articles to be heat treated in a controlled atmosphere, are charged into the chamber 2 of the oven. The products of combustion from the burners "6 will be largely carbon dioxide and other gases which are inert with relation to the'articles being treated. Said inert gases passing from the chamber 4 will have very considcrable heating effects in passing through the radiators 77 and headers 88 and will be recirculated.through the ducts 99 into the lower portion of the chamber 2, whereby to provide the inert atmosphere re quired for heat treatment of the articles within said chamber 2. By inspection of the recorder 13 it may be determined whether the burners 66 are operating properly and whether or not the proportions of inert gases are being held within the desired limits. In the event that air from the outside is to be admitted into the chamber 3 independently of. the burners 66. such air may be admitted, of course, through any suitable dampers such as the dampers 9 -9 Though the preferred embodiment of the present invention has been described, many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims. i

What is claimed is 1. In an oven, in combination, means providing a heating chamber for receiving articles to be heat treated and a combustion chamber below said heating chamber, said means including a partition wall, radiating means within said heating chamber and having communication with said combustion chamber, recirculating means connected with thermal relationship with one another but partitioned from one another, radiating means having thermal commnnication with said heating chamber, Said radiating means being connected to said combustion chamber and being also connected to said heating chamber, whereby to discharge products of combustion from Siliti combustion chamber into said heating chamber. Ftlitl radiating means being provided with damper means communicating with the outside air.

Signed at Chicago, Illinois, this 27th day of May, 1927.

CLARENCE A. HERB ST. 

